AISI 4340 Fasteners

AISI 4340 Bolts

Boltport offers made to order AISI 4340 fasteners in varieties of bolts, screws, stud bolts, studs, threaded rods, nuts, washers, pins & other bolting components, in hot forged condition. We are a manufacturer and supplier of AISI 4340 fasteners, produced from high integrity 4340 bar stock or forging stock to various ASTM and international material specifications. AISI 4340 fasteners posseses high bolting strength and used for high temperature, high pressure applications. We offer both metric and imperial sizes bolting parts in 4340 alloy steel. Smaller sizes bolting are often manufactured through cold forming while bigger sizes and custom parts are produced through hot forming and bar machining. Automotive manufactures often refer to SAE Grade 4340 for ordering fasteners. AISI 4340 fastening components are widely used for bolting applications in automotives, structural construction, shipbuilding and repair, marine engineering, power plants, etc.

AISI 4340 is commonly produced in form of standard and heavy hex head bolts, socket head cap screws, allen head screws, countersunk screws, set screws, lifting eye bolts, eye nuts, hex nuts, heavy hex nuts, stud bolts, tap end studs, double end stud bolts, plain threaded rods, heavy duty washers, dowel pins and other customised bolting components.

Find information on this alloy grade such as chemical composition, mechanical properties, feasible fastener products, related material specifications and applications.

AISI 4340 Properties

Chemical Composition

  • Carbon C 0.38 - 0.43 %
  • Manganese Mn 0.75 - 1.00 %
  • Sulphur S 0.04 % max
  • Phosphorus P 0.035 % max
  • Silicon Si 0.15 - 0.30 %
  • Molybdenum Mo 0.15 - 0.25 %
  • Chromium Cr 0.80 - 1.10 %
  • Iron Fe 96.78 - 97.77%

Mechanical Properties

  • Tensile Strength : 655 MPa (Min.)
  • Yield Strength : 415 MPa (Min.)
  • Hardness, Rockwell : 25 - 70
  • Hardness, Brinell : 197 (Min.)

AISI 4340 Equivalent Grade Designations

AISI European Name UNS Designation DIN / EN / Werkstoff
4340 36CrNiMo4 G43400 1.6511

AISI 4340 Fastening Products

Material Specifications for AISI 4340

Specifications Material Form Products
ASTM A29 AISI 4340/UNS G43400 Bars and Rods Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A108 AISI 4340/UNS G43400 Bars and Rods Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A193 Grade B7/ B7M Bolting/td> Bolts, Screws, Stud Bolts, Threaded Rods
ASTM A194 Grade 7/7M Bolting Nuts
ASTM A320 Grade L7/L7M/L7D Bolting Bolts, Screws, Stud Bolts, Threaded Rods
ASTM A322 AISI 4340/UNS G43400 Bars and Rods Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A331 AISI 4340/UNS G43400 Bars and Rods Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A506 AISI 4340/UNS G43400 Sheet, Plates & Strips Washers, Sheet Metal Components
ASTM A574 Grade 8 Bolting Socket Head cap Screws
ASTM A829 AISI 4340/UNS G43400 Sheet, Plates & Strips Washers, Sheet Metal Components
ASTM F568 Grade 12.9 Bolting Bolts, Screws, Stud Bolts, Threaded Rods
SAE J404 AISI 4340/UNS G43400 Alloy Steel Chemical Composition Requirements
SAE J1397 AISI 4340/UNS G43400 Alloy Steel Chemical Composition Requirements

Coating Options for AISI 4340 Fasteners

Product Keywords

Alloy Steel, AISI 4340, Fasteners, Bolts, Screws, Stud Bolts, Threaded Rods, Nuts, Washers, Dowel Pins, Custom Bolting, Components, Grade Equivalent, UNS G43400, DIN 1.6511, 36CrNiMo4, Products, Material Specifications, Coatings.